*{
    padding: 0;
    margin: 0;
    list-style: none;
    box-sizing: border-box;
}
html,body{
    width: 100%;
    height: 100%;
    background: #000;
}
.box{
    width: 302px;
    min-height: 200px;
    margin: 30px auto 0;
    border: 1px solid #CCC;
}

.users{
    display: flex;
    flex-wrap: wrap;
    color: #FFF;
}
.users li{
    margin:15px;
    width: 70px;
    height: 40px;
    background: #F00;
    line-height: 40px;
    text-align: center;
}

.box button{
    display: block;
    margin: 30px auto 0;
    width: 80px;
    height: 45px;
    background: purple;
    color: #FFF;
    border: 0;
}